#include<iostream>
using namespace std;
int gcd(int a,int b){
    return b?gcd(b,a%b):a;
}

int main(){
    int t;
    cin>>t;
    while(t--){
        int a,b;
        cin>>a>>b;
        cout<<gcd(a,b)<<endl;
    }
    
    
    return 0;
}
